4,4′-Dibromo-2,2′-bipyridine is a key intermediate to make other 4,4’-synmmetric substituted-2,2’-bipyridine toenhance the absorption coefficient of the MLCT band by increasing the conjugation length of the ancillary ligand of the bipyridine scalefold. These activities have been produced many kinds of bipyridine ligands applied for DSSC, OFET, sensor, and catylsts for polymerization.